VOLCANIC EARTHQUAKES 105 
As examples of radial earthquakes on the southeastern flank, 
I have selected three which have been studied in perhaps greater 
detail than others, namely, the Fondo Macchia earthquake of July 
19, 1865, the Fleri earthquake of August 8, 1894, and the Linera 
earthquake of May 8, 1914. The Fondo Macchia earthquake of 
October 15, 1911, is given as 
an example of a perimetric 
~ earthquake. 
Radial earthquakes.—On 
Baenuany 20, 1805, a great 
eruption took place on the 
east-northeast flank of Etna, 
which lasted nearly twelve 
weeks. Eighty-eight days 
after its close, on July 10, 
Fondo Macchia was com- 
pletely destroyed by an 
earthquake, and the neigh- 
boring villages of Baglio, 
Rondinello, Scaronazzi, and 
S. Venerina were seriously 
damaged, though not ruined. 
The meizoseismal area was a 
narrow band directed W.NW. 
andr ESE. a little over 4 
miles in length and about 2 
Eieieivide. Outside this | its 
band, the shock was disas- Fic. 2.—Map of earthquakes on southeast 
trous within an area 5 miles flank of Etna. 
long and 14 miles wide, 
represented by the curve A on the sketch map (Fig. 2). The 
intensity of the shock diminished rapidly toward the north, and 
more slowly toward the south, but at no place more than 12 
miles from the epicenter was the shock felt. The area dis- 
turbed cannot therefore have exceeded 113, and was probably 
less than 100, square miles. A number of after-shocks followed 
this earthquake, 24 being felt in July (3 of them very strong at 
: ‘ ° 
Acireale 
Scale of Miles 
